title: Some properties of alkali-extracted red cell ghost membranes.
abstract: The properties of integral membrane proteins obtained by dilute alkali extraction of red cell ghosts were examined. A variety of conditions promoted the disulfide-mediated aggregation of integral membrane proteins, principally band 3. Procedural modifications which minimized aggregation were the use of EDTA and S-alkylation. Integral membrane proteins were solubilized under non-denaturing conditions using Brij 36T, a lauryl polyoxyethylene ether with an NMR-determined average chain length of 8.2 (oxyethylene) units. Detergent gel filtration revealed a chromatographic shoulder due to aggregated band 3 when membrane proteins were not alkylated. Analyses of the column profile also revealed a discrete peak for sialoglycoproteins and two phosphate peaks, an early one due to phospholipid and a later one not identified, but probably due to phosphoinositide.
mesh_terms: D002449:Cell Aggregation; D003902:Detergents; D004220:Disulfides / Q000097:blood; D004492:Edetic Acid; D004910:Erythrocyte Membrane / Q000648:ultrastructure*; D004912:Erythrocytes / Q000648:ultrastructure*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008565:Membrane Proteins / Q000097:blood* / Q000302:isolation & purification
chemical_list: D003902:Detergents; D004220:Disulfides; D008565:Membrane Proteins; D004492:Edetic Acid